<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../../dist/vue.js"></script>
</head>
<body>
  <div id="demo">
    <h1>初始化流程</h1>
    {{foo}}
  </div>
</body>
</html>
 
<script>
  const app= new Vue({
    el:'#demo',
    data:{foo:'foo'},
   // render(h){return h('div','render')}
  })
  console.log(app.$options.render)
</script>